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cromax X458 Service Manual Download Page 27

X458                                                          L3 Service Manual                                                                                                                                 

 

 

27 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N0/weak signal trouble shooing 

 

No or weak signal 

Inspect the antenna and 

antenna connector to see 

if there’s any distortion 

Replace the defective 

components. 

Put a false antenna at RF PA 
IC to see if there’s any signal   

Replace RF PA IC. 

Make a false antenna at 

SAW501 or SAW502, 

check if there’s any 

signal 

Saw filter is damaged, 

replace it. 

Replace X801/26M 

oscillator to check if 

the problem is solved. 

Resolder or replace 

CPU MT6260 

END 

YES 

NO 

YES 

NO 

YES 

NO 

OK 

All manuals and user guides at all-guides.com

Summary of Contents for X458

Page 1: ...X458 L3 Service Manual 1 All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 2: ...ecified tools and equipments for servicing in which the parameters need to be calibrated with specified criteria Content 1 Brief Introduction 3 2 Exploded View 4 3 Tools 5 4 Assemble Dissemble Dissembly 6 8 Assembly 9 11 5 Picture of main board A B side of PCBA 12 A B of PCBA Layout 13 6 System Block Chart 14 7 Unit Circuit Map 16 21 8 Trouble Shooting Guide 22 27 9 Upgrading IMEI writing 28 36 10...

Page 3: ...y Software BT 3 0 Memory 64M 128M Lithium Battery Standard 1050mAh USB Data cable USB 1 1 Features Functions Dual SIM Dual Standby Single working Full touch FM Multi Media application 0 3MP with sw upgarde to 1 3MP T Flash Support 8G T Card 3 5 HVGA 320 480 MP3 MP4 AVI 3GP USB1 1 Mini USB All manuals and user guides at all guides com ...

Page 4: ...X458 L3 Service Manual 4 Chapter 2 Exploded View All manuals and user guides at all guides com ...

Page 5: ...5 Chapter 3 Tools Power Supply Multimeter Solder iron Hot Air Gun Solder wire Flux PC Download cable Others Pick Screw Driver Tweezer Wrist grounding strap Antistatic gloves Cable All manuals and user guides at all guides com ...

Page 6: ...ocess 1 Remove the battery cover 2 Unfasten the 4 screws by screw driver 4 Unfasten the 2 screws by screw driver 5 Remove the TP connector 3 Prize up the back cover 6 Stick protection film for front cover All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 7: ...X458 L3 Service Manual 7 Finished 7 Remove the TP 8 Remove the LCD by electric soldering iron All manuals and user guides at all guides com ...

Page 8: ...8 2 Assembly Process Finished 4 Fasten the 2 screws 3 Install the PCBA 1 Install the TP 2 Install the LCD by electric soldering iron 6 Fasten the 4 screws 5 Install the back cover All manuals and user guides at all guides com ...

Page 9: ...A Side A Location of components 5 2 Side B PCBA Side B Location of Components J201 battery conector I O connector U101 CPU U800 wifi chip Mic Camera connector U301 26MHZ LCD Connector U302 RF PA U401 FLASH J401 Audio jack All manuals and user guides at all guides com ...

Page 10: ...X458 L3 Service Manual 10 5 3 PCBA Layout side A 5 4 PCB Layout Side B All manuals and user guides at all guides com ...

Page 11: ...X458 L3 Service Manual 11 Chapter 6 System Block Chart All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 12: ...ce Manual 12 Chapter 7 Circuit diagram for each unit Data Transfer Interface Keypad Interface Audio Processing SIM Data Transfer control T T flash Data transfer control All manuals and user guides at all guides com ...

Page 13: ...X458 L3 Service Manual 13 All manuals and user guides at all guides com ...

Page 14: ...X458 L3 Service Manual 14 Output of SIM Card All manuals and user guides at all guides com ...

Page 15: ...X458 L3 Service Manual 15 CPU POWER SUPPLY OUTPUT PORT All manuals and user guides at all guides com ...

Page 16: ...X458 L3 Service Manual 16 I O Interface 5PIN PA All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 17: ...X458 L3 Service Manual 17 Display interface All manuals and user guides at all guides com ...

Page 18: ...rcuit Cannot download Check if it is caused by the PC cable tools etc Power on NO NO NO NO YES YES YES No YES OK Replace or re config Check I O Connector Connect the cable check if the current is normal about 30 mA Disconnect the cable and check if the chipset is over heat Check VCORE VDD VADD VTCXO VRTC VMEM 26MHZ 32KHcrystal Replace U101 MT6260 All manuals and user guides at all guides com ...

Page 19: ...Make the phone connect the power supply and find the current swing at 50 100mA END Check the power manage supply output VCCRE 1 8V VDD 2 8V AVDD 2 8V VTCXO 2 8V VMEM 2 8V VRTC 1 2V Replace U101 MT6260 Upgrade the software Check and replace the I O connector Replace or reweld flash Replace or reweld CPU All manuals and user guides at all guides com ...

Page 20: ... flash 26MHZ Check and replace system clock 26MHz Check the power manage supply output VCCRE 1 8V VDD 2 8V AVDD 2 8V VTCXO 2 8V VMEM 2 8V VRTC 1 2V Replace or reweld CPU Replace U101 MT6260 Make the phone connect the power supply and find low or no current Check the battery connector and power key NO NO YES YES NO NO NO YES NO NO All manuals and user guides at all guides com ...

Page 21: ...and replace RF PA Audio PA Check if the capacitance varistor LDO tube leakage Use the touch method to check and replace the heat spare parts Make the phone connect the power supply and then press power key find large current make the phone heat YES YES NO YES YES NO NO YES All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 22: ... panel Check battery connector and battery touch point if is dropped or dirty Check the keypad if stuck or touch panel do not work to make the phone dead Check the CPU if is rosin joint or damage END Clean or replace the battery or battery connector U101 Reweld or replace U101 Upgrade the Software YES NO YES NO YES YES All manuals and user guides at all guides com ...

Page 23: ...f J701 have signal or not check 8th digit cable status No display or display abnormality after power on Check LCD connector is OK or not Change LCD FPC Change or re solder U101 MT6260 Check LCD if damage or liquid flow out Change LCD Clean re solder connector Upgrade software All manuals and user guides at all guides com ...

Page 24: ... problem Upgrade software to check if can solve this problem Visual check if any corrosion or short circuit and use multimeter to check if any short circuit for single key Clean the place which is corrosion or short circuit Re solder or change CPU U101 MT6260 Clean it Use multimeter to check if the voltage is 0 7V or not All manuals and user guides at all guides com ...

Page 25: ...LED can work or not Changed or re solder CPU MT6260 Key light can t work Use multimeter to check voltage of LED is OK or not Problem solve Expect bar model Check if circuit is broken Change LED Upgrade software 软件升级 Problem solve YES YES NO NO YES NO All manuals and user guides at all guides com ...

Page 26: ...ive NO Replace SIM card MT6250 may be defective Insert SIM Clean or replace SIM connector Check if all the SIM pins are clean Resolved If SIM card is available Connect Power supply to check the current Resolder or replace CPU MT6260 END All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 27: ...fective components Put a false antenna at RF PA IC to see if there s any signal Replace RF PA IC Make a false antenna at SAW501 or SAW502 check if there s any signal Saw filter is damaged replace it Replace X801 26M oscillator to check if the problem is solved Resolder or replace CPU MT6260 END YES NO YES NO YES NO OK All manuals and user guides at all guides com ...

Page 28: ...ignal by oscillograph No sound or noise Remove the speaker and measure with multimeter to see if there s any sound Replace speaker The phone is in Silent mode Check if the volume is in lowest mode Turn up the volume Replace U101 MT6260 Press power on and side button to check if there s the ring is normal All manuals and user guides at all guides com ...

Page 29: ... signal with oscillograph under calling mode Receiver is low Check if LS402 is damaged Resolder clean LS401 Check if the receiver is broken or damaged Test if there s sound from receiver with multimeter Replace receiver Replace CPU U101 MT6260 Set the phone as handsfree mode END All manuals and user guides at all guides com ...

Page 30: ...here s MIC cover 84666 and activate echo loop measure MIC MK400 voltage is 1 5V 0 7V Replace MIC Replace B402 or B405 Check if inductor B402 B405 is damaged Replace C421 C422 Measure C421 C422 with multimeter to see if there s 0 5V offset voltage Resolder or replace CPU U101 MT6260 END All manuals and user guides at all guides com ...

Page 31: ...r R214 R205 be normal Replace or re solder CPU U101 MT6260 Remind error during charge Check charge protective tube U200 be normal Check battery connector testing Pin if the bias resis and vatge be normal Change battery Re flash SW Resolved Replace or re solder NO NO NO YES YES All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 32: ...k if the voltage of positive pole is around 3 6V Check charge protective tube be normal Replace or re solder CPU MT6260 No charge Does not charge no charge in Change battery Re flash SW Resolved Check if I O connector works normal Replace or re solder it NO NO YES YES NO YES YES YES YES All manuals and user guides at all guides com ...

Page 33: ...ected Does not charge does not recognize charging Change battery Re flash SW Resolved NO YES YES YES YES YES Re solder or replace I O connector There is no symbol shows charging Power on and connect charger input 84666 to check if ADC is around 0 40A Check battery connector testing Pin if the bias resis and vatge be normal NO YES NO All manuals and user guides at all guides com ...

Page 34: ...y short time Power on the phone check the if working current be normal no exceed 600mA Defective resolved YES YES YES Check and replace RF PA AUDIO PA NO NO YES Check if the components on the PCB are damaged capacitor power supplier LDO etc By touch to find the component getting hot replace it Change battery Re flash SW NO NO YES YES NO NO NO NO All manuals and user guides at all guides com ...

Page 35: ... VMC was 2 8V NO Re solder T flash slot NO Check if the voltage of T Flash pin3 pin5 pin7 to the ground was around 0 7V with multimeter diode column Measure if there is pin short for the T flash adjacent pins YES Check if replace T Flash slot can fix this problem YES CPU MT6250 solder poor or damaged NO Re solder or replace CPU MT6260 All manuals and user guides at all guides com ...

Page 36: ...he PCBA and open the camera function Check if C604 C605have 2 7V or 1 5V voltage Upgrade SW to check if it was related to SW Check if camera slot appearance was ok or if there is solder problem Re solder or replace the camera slot Re solder or Replace CPU U101 MT6260 NO NO YES YES NO All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 37: ...s 1 2v start voltage on R810 R811 Check if R810 R811 0ohm was good Check if there is 2 8v Voltage input on C807 C808 Replace power manage IC Check if there is 26Mhz clock signal output on CPU by Pin AA5 Re solder or Replace U801 ATV chip Re solder or Replace CPU END YES YES NO YES NO YES YES YES All manuals and user guides at all guides com ...

Page 38: ... driver need to be installed before using the USB cable Please keep the USB cable unplugged when installing the driver Plug the USB cable when installing is completed And check device manager of the PC 9 1 3 Please select Options COM port Choose the port which is same as the one in Device Manager 9 1 2 Run the Flash_tool exe of FlashTool_v5 1112 00 All manuals and user guides at all guides com ...

Page 39: ...X458 L3 Service Manual 39 9 1 4 Select Options Format FAT DISABLED and please do NOT select validation 9 1 5 Please select Format FAT Select Format FAT All manuals and user guides at all guides com ...

Page 40: ... 40 9 1 6 Select Options Backup and Restore then select the Backup Download format Restore 9 1 7 Click the Download Agent and select the file MTK ALLInOne DA bin Select this one All manuals and user guides at all guides com ...

Page 41: ...the handset remove the battery click Download and connect the cable with handset then insert the battery press the power on button the gray red blue green and gray progress bar shall appear Then upgrade would be completed when appear OK Select this one All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 42: ...X458 L3 Service Manual 42 9 1 10 Backup the data gray progress bar 9 1 11 Connect to phone red progress bar All manuals and user guides at all guides com ...

Page 43: ... is in process blue progress bar 9 1 13 Downloading is completed 9 1 14 Power on phone and input 84666 select one key Restore phone will be reboot then the user s setting could be eliminated entirely All manuals and user guides at all guides com ...

Page 44: ...for hardware Corrective action check software fit for hardware whether or not resolding CPU and FLASH or exchange new CPU and FLASH 图 1 figure 1 Description E930 can t power on handset is dead when upgrade software details as figure 2 Root cause the power supply and clock both work on as common during upgrade software The typical defective issue as poor soldering or go to fall other way as exchang...

Page 45: ...ing Guide 9 2 1 Plug the correct upgrade cable to the computer then run IMEI writer For the first time you run IMEI Writer in the computer below figure would be occur then choose IMEI_Writer exe All manuals and user guides at all guides com ...

Page 46: ...r power off the phone and then click Restart after 3 seconds plug the phone cable connector to the phone and power on the phone it starts to write IMEI Choose it Click here to change the database file Write dual IMEI Select COM port All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 47: ...pad Press every button on the handset until the screen is clear 4 Vibrator Press start then the vibration shall start 5 Lond SPK Press start the speaker shall work 6 Ringtone Press start the ringtone shall be played 7 LED Press OK to test the LED 8 LCD Select Auto Display LCD shall perform the self testing 9 Receiver Press start the receiver shall produce sound 10 Camera Menu Camera test the captu...

Page 48: ...X458 L3 Service Manual 48 All manuals and user guides at all guides com ...

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